FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerunterlagen 1991
Value from the PTB table, not verified
illsonic waffel soft foam sound absorber with waffle structure
illsonic waffel
PTB reference data
Original description
illsonic waffel soft foam sound absorber with waffle structure
Material properties
Manufacturer: illbruck GmbH
Thickness: 2 in, 2.8 in
Surface: waffle structure
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.90
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.95 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 2.8 in | NRC0.90 | |
| 2 in | NRC0.75 |
NRC: 0.90 (derived from ISO 354 lab data)
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 50 mm · offenporige Schaumkunststoff-Oberfläche, unterschiedliche Waffel-Strukturen verfügbar | 0.75 | 0.19 | 0.32 | 0.71 | 1.02 | 1.02 | 1.06 |
| 70 mm · offenporige Schaumkunststoff-Oberfläche, unterschiedliche Waffel-Strukturen verfügbar | 0.90 | 0.24 | 0.56 | 0.96 | 1.13 | 1.04 | 1.19 |
Measured values as a table (2 measurements)
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